ZERO-INVASION ACIDIC DRILLING FLUID

摘要

A drilling fluid system using retarded acid systems such as gelled acid (VES or polymer) and/or emulsified acid to drill carbonate formations (calcite and dolomite). Foamed acid may be used in low abnormal pressure carbonate reservoirs. The drilling fluid system permits drilling a target hydrocarbon-producing formation with zero-invasion of the drilling fluid system. A method for using the drilling fluid system for fluid loss control during drilling operations.

主权项

1: An acidic drilling fluid system comprising:
an aqueous acidic solution; a silicate; and a hydrocarbon-based isolation fluid; wherein the aqueous acidic solution, the silicate and the hydrocarbon-based isolation fluid are on the form of an emulsion.